RazMan
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| posted on 8/12/10 at 04:30 PM |
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Longshot - huge countersink bit?
I'm looking for a 40mm ish diameter countersink bit. I want to make a small 'lead in' on my throttle bodies which are 35mm dia.
Ideally I just need to borrow one for a day or two but if one is available for a reasonable price I might be able to find some beer tokens 
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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MikeCapon
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| posted on 8/12/10 at 04:33 PM |
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Valve seat cutter???
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RazMan
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| posted on 8/12/10 at 04:53 PM |
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Now why didn't I think of that? 
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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Fred W B
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| posted on 8/12/10 at 05:01 PM |
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Or any cutting tool (router bit?) designed for wood will work fine - assumiming the parts are ally.
Cheers
Fred W B
You can do it quickly. You can do it cheap. You can do it right. – Pick any two.
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RazMan
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| posted on 8/12/10 at 05:18 PM |
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Good call Fred 
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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matt_gsxr
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| posted on 8/12/10 at 06:40 PM |
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Or even a deburring tool, these work nicely on aluminium. If you just want to take a little off.
http://www.cbsonline.co.uk/swivelling-blade-deburring-tool-swdeb-838-p.asp
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RazMan
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| posted on 8/12/10 at 09:35 PM |
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Cheers Matt, I think the router bit like this one
would be the best option as it gives a rounded profile which is perfect for gas flow. I just need to find one at B&Q (that one is only £7 but from
Hong Kong) or similar - only need a cheap one as it will only get used once or twice.
*edit* Just found one on eBay for £7 and free p&p
[Edited on 8-12-10 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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Fred W B
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| posted on 9/12/10 at 11:33 AM |
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Just make sure you turn it carefully/slowly, maybe by hand?
Fred W B
[Edited on 9/12/10 by Fred W B]
You can do it quickly. You can do it cheap. You can do it right. – Pick any two.
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David Jenkins
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| posted on 9/12/10 at 12:05 PM |
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The thought of applying that router bit to the end of an aluminium tube terrifies me... 
...they're scary enough when used on the edge of a big slab of wood!
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RazMan
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| posted on 9/12/10 at 12:32 PM |
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Yes, and in the cold light of day I have had slight re-think (I had dreams about flying swarf last night )
I think a golf ball with a bolt through the middle might act as a shaped holder for some emery cloth. Using a cordless drill and pushing the
ball/emery into the opening of the TB, it shouldn't take too much effort to give me a small lead-in.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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MikeR
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| posted on 9/12/10 at 12:39 PM |
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but it has given me an idea ..........
What is the opposite shape to the "rounding over" shape?
Ie the rounding over bits 'cut' is the inside of a circle, i want the cut to be the 'outside' of the circle?
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